Portable burglar alarm



Patented Nov; 24, 1925.

GEORGE J'. MAUD, OF ADENA, OHIO.

PORTABLE BURGLAR ALARM.

Application filed. July 10, 1923. Serial No. 650,608.

To all whom t may concern:

Be it known that I, GEORGE J. MAUD, a citizen of the United States,residing at Adena, in the county of Jeiierson and State of Ohio, haveinvented certain new and useful Improvements in Portable Burglar Alarms,of which the following -is a specification.

In carrying out the present invention, it is my purpose to provide aburglar' alarm oi the portable electric type, whereby the same may beplaced in close proximity to windows or doors, to be actuated by saidwindows or doors, for giving an alarm whenever desired.

The primary object of my invention is to provide such an alarm that isextremely simple oi' construction, and one that embraces at the sametime, the desired features of eiiiciency and durability, the deviceconiprising relatively few parts, and these correlated in such a manneras to reduce the possibility of disarrangement to a minimum.

The nature and advantages of the invention will be better understoodwhen the foilowing detailed description is read in connection with theaccompanying drawings, the inif'ontion residing in the construction,combination, and arrangement of parts as claimed.

Tn the drawings forming part of this application, like numerals oireference indicate similar parts in the several views, and wherein:

Figure 1 is a detail vertical cross section thereof.

Figure 2 is a transverse cross section upon the line 3-3 of Figure 1,showing more clearly the form of trigger mechanism for the movablecontact member that forms an essential part of the present invention.

Figure 3 is a detail vertical cross section taken substantially upon theline 4 4 of the same iigure, and

Figure '-i is an enlarged perspective of the circuit completing plunger,per se.

New, having particular reference to the drawings, my novel alarmembodies a cylindrical container 5 open at one end, and provided with adesirable form oi' carrying handle 6. Within this container is any formof dry cell battery 7, the negative pole 8 ci which has electricalconnection to a pair of electromagnets 9, that are supported within acylindrical ea-p, that is positioned over closed end of the casing 5, asmore clearly shown in Figure 2.

The cap carries an external bell 12 to be sounded by a hammer 13 that isalso supported within the cap, and has its head pro jecting through anopening in the bottom wall thereof, as shown, it being of courseunderstood that this hammer is to be vibratefl by the pair of magnets 9.

Upon the opposite end of the casing 5 and having its lower edgesupported upon a shoulder 14 formed upon the outer side oli said casingand adjacent the upper end thereof is another cap 15, that has anoponing in its closed end to permit the free sliding movement therein ofa contact or circuit closing rod 16, this contact rod being additionallyguided by a U shaped bracket 17, within said cap as shown in Figure 2.The contact rod 16 is in vertical alinemcnt with the central positivepole 18 of said hatq tery and is adapted for engagement there with in amanner presently to be set iforth for completing the circuit irom thebattery through the rod 16 through the ca 3 15, casing 5, shell 11 andback to the negative pole 8. Slidable upon the cap is a strip 19, thatis provided adjacent its opposite ends with guide slots 20 through whichextend rivets 21 for allowing a free sliding movement oi the strip inopposite directions. This plate or strip 19 is formed between said slotswith an additional key slot 22, through which said contact rod 16 hasmovement. This rod is provided at one side at a point intermediate itsends with a notch 28, for receiving one of the side walls of therestricted portion oi said key hole slot when the plate 19 has beenmoved to the position of Figure 3 for holding the contact rod in theposition shown in Figure 2, that is, out of engagement with the positivepole 18 of the battery.

Surrounding the contact rod 16 between an abutment in the form of a disk24C formed upon the rod and the top wall of said shell 15 is anexpansion spring 25 that serves as a means for forcing the rod inwardlyinto engagement with the said pole 18, when the plate 19 is moved to theleft. This rod 16 is additionally formed upon opposite sides and beneaththe notch 23 with other notches 26 for positively retaining the same ininoperative position.

The plate 19, which is in reality a trigger is orllld nl? `011.e @11dwith a lug 27, it being apparent that` afterthe alarm has been set asshoivn in several of the views, the article is placed adjacent door,whereby the door Will strike said lug for releasing the contact bar andcompleting the circuit to the magnets 9 for sounding the alarm.

In this connection, it should be noted that the aforesaid handle Grestsupon the ioor 'J adjacent the door and prevents the device from rollingover and sliding along the iioor. The handle need not necessarily beanchored upon the floor and when the door is forced against the device,itv is slid along the floor against the action ot the handle. Thehandle, however, holds the device in position sui'liciently long enoughvt'o permit the door to close the trigger and to allow the alarm tooperate.

Numerous advantages oit a device of this character Will be at onceappreciated by those skilled in the art, and although I have Lhereinshown and described "the most preferred, en'ibfodiinent of theinvention, it is nevertheless to be understood that minor changes may bemade therein, Without departing from the spirit 'and scope of theinvention as claimed. Y

Having thus 'described my invention, what I claim as new, and desire tosecure by Letters-Patent, is:

l. A device of the class Vdescribed coniprising a casing open Iat oneend, a battery inserted ihto said casingthrough said open f end andvhaving its contacts close to said end7 'a closingeap for 'said 'openend ittedthereon,ra guide "carried by said cap and disposed yinaligninentAiv-ith 'one of said contacts,ja

spring pressed ycircuit 'closing rod slidably mounted in said guide and'adapted to be pressed against 'said last mentioned Contact,

said rod being provided between its ends with a retaining shoulder, atrigger slidably mounted upon the vcap 'and provided with a key holeslot through which said rod passes slidably, the vshoulder on said rodbeing opera-ble with the restricted portion of said key hole slot, tomaintain the rod in a set position, and an audible alarm mounted uponthe casing having electric circuit connection with said battery.

2. A device or' the class described coniprising an open ended casing, abattery-ntted vinto the 'casing through said open end, a closing cap forsaid open end, rsaid cap being provided on its interior `vvith a U-shaped guide nien'iber in alignment with vthe central Contact of saidbattery, a circuit closing rod slidable through the cap and guide andcooperable with said central 'con-A tact, a spring surrounding the rodfor moving it into engagement with the contact, said rod being providedat its end With a notch forming a shoulder, a trigger slidably mountedupon said cap, the iree end of the trigner being bent laterally toextend in parallelism with 'the body portion of the cap, theintermediate portion 'of the trigger being provided with a keyhole'slot, through which said rod is sli'd'able, said shoulder beingcoope'rable with the restricted portion of the slot to hold the red in apredetermined position, another cap fitted upon theopposit'e end of thecasing, electromagnets arranged in said second end cap, a Wireconnection between lthe magnets and the remaining contact of saidbattery, a bell carried by said second cap, and an armature cooperablewith the magnets and equipped With a striker Vengageable With said bell.

In testimony Whereofl aiiix my signature.

GEORGE J. Mann.

